DANB ICE Disease Transmission & Safety Protocols 2 — Questions and Answers
Question 1: Which route of disease transmission is most significant in dental healthcare settings?
- Airborne via droplet nuclei
- Direct contact with blood through percutaneous injury (Correct answer)
- Fecal-oral from contaminated water
- Vector-borne through arthropods
Correct answer: Direct contact with blood through percutaneous injury
Percutaneous injuries (needlestick, sharp instrument cuts) represent the most significant route for bloodborne pathogen transmission in dental settings.
Risk of infection per needlestick: HBV (6-30% if unvaccinated), HCV (approximately 1.8%), HIV (approximately 0.3%). This is why OSHA mandates engineering controls, safety devices, sharps containers, and hepatitis B vaccination at no cost.
Question 2: What is the primary purpose of Standard Precautions in dental practice?
- To prevent transmission only when infection status is known
- To treat all patients as potentially infectious and prevent pathogen transmission (Correct answer)
- To eliminate need for medical history reviews
- To protect only dental personnel
Correct answer: To treat all patients as potentially infectious and prevent pathogen transmission
Standard Precautions assume all blood, body fluids, non-intact skin, and mucous membranes may contain transmissible agents regardless of known infection status.
Standard Precautions evolved from Universal Precautions and Body Substance Isolation, combining elements of both. They include hand hygiene, PPE, safe injection practices, equipment handling, respiratory hygiene, and instrument reprocessing. Many infected patients are asymptomatic, so relying on known status leaves workers unprotected.
Question 3: When should Transmission-Based Precautions be added to Standard Precautions in a dental office?
- For all routine procedures
- When a patient has a known or suspected infection requiring additional precautions beyond standard measures (Correct answer)
- Only during oral surgery
- Only during respiratory illness season
Correct answer: When a patient has a known or suspected infection requiring additional precautions beyond standard measures
Transmission-Based Precautions supplement Standard Precautions for specific pathogens spread by contact, droplet, or airborne routes.
Three categories: Contact (MRSA, VRE, scabies), Droplet (influenza, pertussis, mumps—surgical mask within 6 feet), and Airborne (TB, measles, varicella—N95 respirators, negative-pressure rooms). Patients with suspected active TB should not receive elective dental treatment.
Question 4: What is the recommended post-exposure protocol after a dental needlestick injury?
- Apply pressure for 5 minutes, then return to work
- Immediately wash the wound, report the incident, seek medical evaluation, and test the source patient (Correct answer)
- Apply alcohol and monitor for a month
- No action needed if vaccinated against hepatitis B
Correct answer: Immediately wash the wound, report the incident, seek medical evaluation, and test the source patient
The protocol includes immediate wound washing, reporting, medical evaluation with baseline blood testing, source patient testing, and potential post-exposure prophylaxis.
Steps: 1) Wash with soap and water, 2) Report immediately, 3) Medical evaluation ASAP, 4) Source patient testing with consent, 5) Baseline blood draw, 6) PEP if indicated (HIV PEP within 72 hours, HBIG within 24 hours for unvaccinated), 7) Follow-up serial testing.
Question 5: Which patient should have elective dental treatment deferred for medical evaluation?
- Asymptomatic hepatitis B history
- Well-controlled HIV on antiretroviral therapy
- A patient with active productive cough and unexplained weight loss suggestive of pulmonary TB (Correct answer)
- Healed herpes labialis
Correct answer: A patient with active productive cough and unexplained weight loss suggestive of pulmonary TB
Active pulmonary TB symptoms require deferral because TB transmits via airborne droplet nuclei that standard dental masks cannot filter.
TB transmits via droplet nuclei smaller than 5 microns requiring N95 respirators and negative-pressure rooms not available in standard dental offices. Patients with persistent productive cough (3+ weeks), hemoptysis, weight loss, fever, and night sweats should be referred. Patients with treated/latent TB or controlled HIV can receive routine care.
Question 6: What is the chain of infection and why is it important for dental infection control?
- The sequence for sterilizing instruments
- Six linked elements for disease transmission: agent, reservoir, portal of exit, mode of transmission, portal of entry, susceptible host (Correct answer)
- The order for donning PPE
- The supply chain for infection control products
Correct answer: Six linked elements for disease transmission: agent, reservoir, portal of exit, mode of transmission, portal of entry, susceptible host
Understanding the six elements allows targeted interventions at any link to break the chain and prevent infection.
The six elements: infectious agent, reservoir, portal of exit, mode of transmission, portal of entry, susceptible host. Dental infection control targets multiple links: hand hygiene and PPE interrupt transmission, sterilization eliminates agents, vaccination increases host resistance, engineering controls prevent portals of entry.
DANB ICE Disease Transmission & Safety Protocols 2
Which route of disease transmission is most significant in dental healthcare settings?